/Engine/Source/Runtime/Engine/Classes/Engine/AssetManager.h
Returns the list of chunks assigned to the list of primary assets, which is usually a manager list. This is called by GetPackageChunkIds
virtual bool GetPrimaryAssetSetChunkIds ( const [TSet](API\Runtime\Core\Containers\TSet)< [FPrimaryAssetId](API\Runtime\CoreUObject\UObject\FPrimaryAssetId) > & PrimaryAssetSet, const class [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * TargetPlatform, [TArrayView](API\Runtime\Core\Containers\TArrayView)< const int32 > ExistingChunkList, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & OutChunkList ) const